CyberCash, Inc. was an internet payment service for electronic commerce, headquartered in Reston, Virginia. It was founded in August 1994 by Daniel C. Lynch (who served as chairman), William N. Melton (who served as president and CEO, and later chairman), Steve Crocker (Chief Technology Officer), and Bruce G. Wilson. The company initially provided an electronic wallet software to consumers and provided software to merchants to accept credit card payments. Later they also offered "CyberCoin", a micropayment system modeled after the NetBill research project at Carnegie Mellon University, which they later licensed.
In 1995, the company proposed RFC 1898, CyberCash Credit Card Protocol Version 0.8. The company went public on February 19, 1996 with the symbol "CYCH" and its shares rose 79% on the first day of trading. In 1998, CyberCash bought ICVerify, makers of computer-based credit card processing software,  and in 1999 added another software company to their lineup, purchasing Tellan Software.  In January 2000, a teenage Russian hacker nicknamed "Maxus" announced he had cracked CyberCash's ICVerify application; the company denied this, stating that ICVerify was not even in use by the purportedly hacked organization.
On January 1, 2000, many users of CyberCash's ICVerify application fell victim to the Y2K Bug, causing double recording of credit card payments through their system. Although CyberCash had already released a Y2K-compliant update to the software, many users had not installed it.
The company filed for Chapter 11 bankruptcy on March 11, 2001. VeriSign acquired the Cybercash assets (except for ICVerify) and name a couple of months later. On November 21, 2005 PayPal (already an eBay company) acquired VeriSign's payment services, including Cybercash. 
- CyberCash opens Net to small change (News.com, September 30, 1996)
- CyberCash moves to thin wallet (News.com, August 20, 1998)
- Cybercash Disputes Hacker's Claim (Internet News, January 11, 2000)
- "CyberCash to buy ICVerify". CNET News, March 18, 1998. Retrieved 13 January 2010.
- "CyberCash Acquires Tellan Software". Internet News, July 2, 1999. Retrieved 13 January 2010.
- The Wall Street Journal; Eastern edition; January 7, 2000; 1;
- "eBay's PayPal Unit Completes Acquisition of VeriSign's Payment Gateway Business". eBay. Retrieved 20 November 2009.